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underlay

[v. uhn-der-ley; n. uhn-der-ley] /v. ˌʌn dərˈleɪ; n. ˈʌn dərˌleɪ/
verb (used with object), underlaid, underlaying.
1.
to lay under or beneath.
2.
to provide with something laid underneath; raise or support with something laid underneath:
The manufacturer underlays the chrome finish with a zinc coating.
3.
to extend across the bottom of.
noun
4.
something underlaid.
5.
Printing. a piece or pieces of paper put under type or cuts to bring them to the proper height for printing.
Origin
900
before 900; Middle English underleyen, Old English underlecgan; see under-, lay1

underlie

[uhn-der-lahy] /ˌʌn dərˈlaɪ/
verb (used with object), underlay, underlain, underlying.
1.
to lie under or beneath; be situated under.
2.
to be at the basis of; form the foundation of.
3.
Grammar. to function as the root morpheme or original or basic form of (a derived form): The form “boy” underlies “boyish.”.
4.
Finance. to be primary to another right or security.
Origin
before 900; Middle English underlyen (v.), Old English underlicgan. See under-, lie2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for underlay

underlay

verb (transitive) (ˌʌndəˈleɪ) -lays, -laying, -laid
1.
to place (something) under or beneath
2.
to support by something laid beneath
3.
to achieve the correct printing pressure all over (a forme block) or to bring (a block) up to type height by adding material, such as paper, to the appropriate areas beneath it
noun (ˈʌndəˌleɪ)
4.
a layer, lining, support, etc, laid underneath something else
5.
(printing) material, such as paper, used to underlay a forme or block
6.
felt, rubber, etc, laid beneath a carpet to increase insulation and resilience

underlie

/ˌʌndəˈlaɪ/
verb (transitive) -lies, -lying, -lay, -lain
1.
to lie or be placed under or beneath
2.
to be the foundation, cause, or basis of: careful planning underlies all our decisions
3.
(finance) to take priority over (another claim, liability, mortgage, etc): a first mortgage underlies a second
4.
to be the root or stem from which (a word) is derived: "happy" underlies "happiest"
Derived Forms
underlier, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for underlay
v.

Old English under lecgan "to support by placing something beneath;" see under + lay (v.). Related: Underlaid; underlaying.

underlie

v.

Old English under licgan "to be subordinate to, to submit to;" see under + lie (v.2). Meaning "to lie under or beneath" is attested from c.1600; figurative sense of "to be the basis of" is attested from 1852 (implied in underlying).

Online Etymology Dictionary, © 2010 Douglas Harper
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